TMS320F datasheet(225/389 Pages) TI

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Normalize Contents of Accumulator

NORM

7-125

Assembly Language Instructions

Syntax

NORM

ind

Indirect addressing

Operands

ind:

Select one of the following seven options:

*–

*0+

*0–

*BR0+

*BR0–

NORM

ind

987

6543

210

ARU

NAR

Note:

ARU, N, and NAR are defined in section 6.3,

Indirect Addressing Mode (page 6-9).

Execution

Increment PC, then ...

If (ACC) = 0:

Then TC

→ 1;

Else, if (ACC(31)) XOR (ACC(30)) = 0:

Then TC

→ 0,

(ACC)

× 2 → ACC

Modify (current AR) as specified;

Else TC

→ 1.

Status Bits

Affects

Description

The NORM instruction normalizes a signed number that is contained in the ac-

cumulator. Normalizing a fixed-point number separates it into a mantissa and

an exponent by finding the magnitude of the sign-extended number. An exclu-

sive-OR operation is performed on accumulator bits 31 and 30 to determine

if bit 30 is part of the magnitude or part of the sign extension. If they are the

same, they are both sign bits, and the accumulator is left shifted to eliminate

the extra sign bit.

The current AR is modified as specified to generate the magnitude of the expo-

nent. It is assumed that the current AR is initialized before normalization be-

gins. The default modification of the current AR is an increment.

Multiple executions of the NORM instruction may be required to completely

normalize a 32-bit number in the accumulator. Although using NORM with

RPT does not cause execution of NORM to fall out of the repeat loop automati-

cally when the normalization is complete, no operation is performed for the re-

mainder of the repeat loop. NORM functions on both positive and negative 2s-

complement numbers.

Opcode

TMS320F Datasheet(PDF) 225 Page - Texas Instruments

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